Unveiling the Role of Guanidinium for Enhanced Charge Extraction in Inverted Perovskite Solar Cells
Xu W, Min G, Utama Kosasih F, Dong Y, Ge Z, Gu Q, Chen M, Pacalaj RA, Wang T, Webb T, Du T, Righetto M, He G, Hillenius M, von Hauff E, Divitini G, Ducati C, McLachlan MA, Cacialli F, Haque SA, Bakulin AA, Durrant JR, Lin CT, Stranks SD, Macdonald TJ (2025)
Publication Type: Journal article
Publication year: 2025
Journal
Pages Range: 2660-2669
DOI: 10.1021/acsenergylett.5c00469
Abstract
The incorporation of guanidinium (Gua) cations has significantly enhanced the optoelectronic properties of various perovskite compositions. When combined with other A-site cations in perovskite solar cells (PSCs), Gua cations not only enhance the power conversion efficiency of the solar cells but often improve their overall stability. While most studies examining the impact of Gua focus on PSCs with the n-i-p (conventional) structure, fewer have investigated its effects on the mechanism and performance of the p-i-n (inverted) structure. We investigate how partially substituting A-site cations with Gua affects the performance of PSCs and the associated charge carrier dynamics. Enhanced performance is observed in Gua-substituted inverted PSCs, primarily due to improved short-circuit current density and fill factor values. Our spectroscopic and microscopic analyses reveal that these enhancements stem from accelerated charge transport within the perovskite layer combined with inhibited ion migration following Gua incorporation, attributed to the reduction of localized inhomogeneities, which also notably enhance device stability. Our findings elucidate the role of Gua in inverted PSCs, showing negligible impact on open-circuit voltage but significant improvement in charge extraction efficiency. This contrasts with previous reports on conventional structures, where performance enhancement is primarily attributed to trap state reduction, resulting in higher open-circuit voltage.
Involved external institutions
Imperial College London / The Imperial College of Science, Technology and Medicine
United Kingdom (GB)
National Chung Hsing University
Taiwan (TW)
University of Cambridge
United Kingdom (GB)
London Centre for Nanotechnology (LCN)
United Kingdom (GB)
University College London (UCL)
United Kingdom (GB)
Vrije Universiteit Amsterdam (VU) / University Amsterdam
Netherlands (NL)
United Kingdom (GB)
National Chung Hsing University
Taiwan (TW)
University of Cambridge
United Kingdom (GB)
London Centre for Nanotechnology (LCN)
United Kingdom (GB)
University College London (UCL)
United Kingdom (GB)
Vrije Universiteit Amsterdam (VU) / University Amsterdam
Netherlands (NL)
How to cite
APA:
Xu, W., Min, G., Utama Kosasih, F., Dong, Y., Ge, Z., Gu, Q.,... Macdonald, T.J. (2025). Unveiling the Role of Guanidinium for Enhanced Charge Extraction in Inverted Perovskite Solar Cells. ACS Energy Letters, 2660-2669. https://doi.org/10.1021/acsenergylett.5c00469
MLA:
Xu, Weidong, et al. "Unveiling the Role of Guanidinium for Enhanced Charge Extraction in Inverted Perovskite Solar Cells." ACS Energy Letters (2025): 2660-2669.
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